[Richard]

Guys. Marc is saying it vibrates at 1400 regardless of gear. I am sorry but that is not likely the driveshaft. I would suspect fouled injector first since it only does it under full throttle. Take it to cabin and have them read the codes. If it is a main bearing or other internal you want to address it now not when it fails

I had a u joint problem. The give away is th vibration was at 60 to 65 mph in 5 or 6 gear. It did not track with engine rpm.